<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title>盒子阴影</title>
		<style>
		#d1{
			margin: 100px;
			height: 200px;
			width: 200px;
			background-color: darkgray;
			box-shadow:  20px 20px 3px red,-20px 20px 3px blue;
		}
		</style>
	</head>
	<body>
		<div id="d1">
			We change lives
		</div>
	</body>
</html>
